You searched for: “acrolect”
acrolect (s) (noun), acrolects (pl)
A language variety, one of a group of related varieties, that is closest to the standard form of the language: Martin's mother told him to speak acrolect when visiting their grandparents and not use the "teenage" language that he used with his friends.
The most prestigious or “highest” social dialect of any language is termed to be an acrolect.
This entry is located in the following unit: acro-, acr- (page 4)